CA1175521A - Elimination des echos dans un systeme duplex a deux fils pour la transmission des donnees avec estimation des composantes de donnees au terminal eloigne - Google Patents

Elimination des echos dans un systeme duplex a deux fils pour la transmission des donnees avec estimation des composantes de donnees au terminal eloigne

Info

Publication number
CA1175521A
CA1175521A CA000373185A CA373185A CA1175521A CA 1175521 A CA1175521 A CA 1175521A CA 000373185 A CA000373185 A CA 000373185A CA 373185 A CA373185 A CA 373185A CA 1175521 A CA1175521 A CA 1175521A
Authority
CA
Canada
Prior art keywords
echo
samples
signal
signals
response
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000373185A
Other languages
English (en)
Inventor
David D. Falconer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Western Electric Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Application granted granted Critical
Publication of CA1175521A publication Critical patent/CA1175521A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Bidirectional Digital Transmission (AREA)
CA000373185A 1980-04-09 1981-03-17 Elimination des echos dans un systeme duplex a deux fils pour la transmission des donnees avec estimation des composantes de donnees au terminal eloigne Expired CA1175521A (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13866380A 1980-04-09 1980-04-09
US138,663 1980-04-09

Publications (1)

Publication Number Publication Date
CA1175521A true CA1175521A (fr) 1984-10-02

Family

ID=22483068

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000373185A Expired CA1175521A (fr) 1980-04-09 1981-03-17 Elimination des echos dans un systeme duplex a deux fils pour la transmission des donnees avec estimation des composantes de donnees au terminal eloigne

Country Status (13)

Country Link
JP (1) JPS56157152A (fr)
AU (1) AU540883B2 (fr)
CA (1) CA1175521A (fr)
CH (1) CH651980A5 (fr)
DE (1) DE3113394C2 (fr)
DK (1) DK149681A (fr)
ES (1) ES501182A0 (fr)
FR (1) FR2480534B1 (fr)
GB (1) GB2075313B (fr)
IL (1) IL62600A (fr)
IT (1) IT1137680B (fr)
NL (1) NL8101741A (fr)
SE (1) SE447437B (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534427A1 (fr) * 1982-10-11 1984-04-13 Trt Telecom Radio Electr Annuleur d'echo pour signal de donnees en bande de base
US4894820A (en) * 1987-03-24 1990-01-16 Oki Electric Industry Co., Ltd. Double-talk detection in an echo canceller
EP0403716B1 (fr) * 1989-06-22 1995-09-13 International Business Machines Corporation Dispositif d'annulation d'écho à ajustement des coefficients de l'annuleur d'écho pendant la transmission en duplex intégral
US6895086B2 (en) 2001-11-13 2005-05-17 Inmate Telephone, Inc. 3-Way call detection system and method
US7248685B2 (en) 2003-08-05 2007-07-24 Inmate Telephone, Inc. Three-way call detection using steganography
EP1714398B8 (fr) 2004-01-29 2009-08-12 Nxp B.V. Suppresseur d'echos a dimensions de palier fonction du niveau d'interference
US20080201158A1 (en) 2007-02-15 2008-08-21 Johnson Mark D System and method for visitation management in a controlled-access environment
US8542802B2 (en) 2007-02-15 2013-09-24 Global Tel*Link Corporation System and method for three-way call detection
US9225838B2 (en) 2009-02-12 2015-12-29 Value-Added Communications, Inc. System and method for detecting three-way call circumvention attempts
US8630726B2 (en) 2009-02-12 2014-01-14 Value-Added Communications, Inc. System and method for detecting three-way call circumvention attempts
US10572961B2 (en) 2016-03-15 2020-02-25 Global Tel*Link Corporation Detection and prevention of inmate to inmate message relay
US9609121B1 (en) 2016-04-07 2017-03-28 Global Tel*Link Corporation System and method for third party monitoring of voice and video calls
US10027797B1 (en) 2017-05-10 2018-07-17 Global Tel*Link Corporation Alarm control for inmate call monitoring
US10225396B2 (en) 2017-05-18 2019-03-05 Global Tel*Link Corporation Third party monitoring of a activity within a monitoring platform
US10860786B2 (en) 2017-06-01 2020-12-08 Global Tel*Link Corporation System and method for analyzing and investigating communication data from a controlled environment
US9930088B1 (en) 2017-06-22 2018-03-27 Global Tel*Link Corporation Utilizing VoIP codec negotiation during a controlled environment call

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499999A (en) * 1966-10-31 1970-03-10 Bell Telephone Labor Inc Closed loop adaptive echo canceller using generalized filter networks
US4087654A (en) * 1975-11-28 1978-05-02 Bell Telephone Laboratories, Incorporated Echo canceller for two-wire full duplex data transmission
US4074086A (en) * 1976-09-07 1978-02-14 Bell Telephone Laboratories, Incorporated Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
SE416367B (sv) * 1976-09-07 1980-12-15 Western Electric Co Ekoelimineringsanordning
JPS5582551A (en) * 1978-12-15 1980-06-21 Nec Corp Echo cancel unit for two line type duplex data communication modem

Also Published As

Publication number Publication date
ES8205088A1 (es) 1982-06-16
AU540883B2 (en) 1984-12-06
SE447437B (sv) 1986-11-10
DK149681A (da) 1981-10-10
ES501182A0 (es) 1982-06-16
JPS56157152A (en) 1981-12-04
SE8102048L (sv) 1981-10-10
NL8101741A (nl) 1981-11-02
CH651980A5 (de) 1985-10-15
DE3113394A1 (de) 1982-05-06
IT8120998A1 (it) 1982-10-08
GB2075313B (en) 1984-05-02
DE3113394C2 (de) 1985-11-21
IT8120998A0 (it) 1981-04-08
GB2075313A (en) 1981-11-11
IL62600A0 (en) 1981-06-29
FR2480534A1 (fr) 1981-10-16
IL62600A (en) 1983-11-30
FR2480534B1 (fr) 1985-05-31
AU6872281A (en) 1981-10-15
IT1137680B (it) 1986-09-10

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Legal Events

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